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• How can I properly create /dev/dvd?

  - by chazomaticus

  Certain programs look for /dev/dvd by default to find DVDs. When I first boot my computer without a DVD inserted, /dev/dvd exists and points to the correct place (/dev/sr0). However, when I insert a DVD, /dev/dvd disappears. I'd like it to stick around so I don't have to navigate to /dev/sr0 in programs that are looking for DVDs. How do I ensure that the /dev/dvd symlink exists and points to the right place? It looks like I can add something to /etc/udev/rules.d/70-persistent-cd.rules. This site gives a couple of examples, but the 70-persistent-cd.rules file says "add the ENV{GENERATED}=1 flag to your own rules", which isn't part of the examples. The man 7 udev page is impenetrable to me, and I'm not convinced the linked page gives 100% of the information I need. So, what can I do on a modern, Ubuntu 12.04 (or later) system to make /dev/dvd always exist and point to the right device? EDIT: Is it as simple as adding ENV{GENERATED}=1 to the rules in the linked page, something like this: SUBSYSTEM=="block", KERNEL=="sr0", SYMLINK+="dvd", GROUP="cdrom", ENV{GENERATED}=1 Is that the right information for modern Ubuntu? What is ENV{GENERATED} doing there, when it wasn't generated, but hand-written?

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• Why does my token return NULL and how can I fix it?(c++)

  - by Van

  I've created a program to get a string input from a user and parse it into tokens and move a robot according to the input. The program is supposed to recognize these inputs(where x is an integer): "forward x" "back x" "turn left x" "turn right x" and "stop". The program does what it's supposed to for all commands except for "stop". When I type "stop" the program prints out "whats happening?" because I've written a line which states: if(token == NULL) { cout << "whats happening?" << endl; } Why does token get NULL, and how can I fix this so it will read "stop" properly? here is the code: bool stopper = 0; void Navigator::manualDrive() { VideoStream video(&myRobot, 0);//allows user to see what robot sees video.startStream(); const int bufSize = 42; char uinput[bufSize]; char delim[] = " "; char *token; while(stopper == 0) { cout << "Enter your directions below: " << endl; cin.getline(uinput,bufSize); Navigator::parseInstruction(uinput); } } /* parseInstruction(char *c) -- parses cstring instructions received * and moves robot accordingly */ void Navigator::parseInstruction(char * uinput) { char delim[] = " "; char *token; // cout << "Enter your directions below: " << endl; // cin.getline (uinput, bufSize); token=strtok(uinput, delim); if(token == NULL) { cout << "whats happening?" << endl; } if(strcmp("forward", token) == 0) { int inches; token = strtok(NULL, delim); inches = atoi (token); double value = fabs(0.0735 * fabs(inches) - 0.0550); myRobot.forward(1, value); } else if(strcmp("back",token) == 0) { int inches; token = strtok(NULL, delim); inches = atoi (token); double value = fabs(0.0735 * fabs(inches) - 0.0550); myRobot.backward(1/*speed*/, value/*time*/); } else if(strcmp("turn",token) == 0) { int degrees; token = strtok(NULL, delim); if(strcmp("left",token) == 0) { token = strtok(uinput, delim); degrees = atoi (token); double value = fabs(0.00467 * degrees - 0.04); myRobot.turnLeft(1/*speed*/, value/*time*/); } else if(strcmp("right",token) == 0) { token = strtok(uinput, delim); degrees = atoi (token); double value = fabs(0.00467 * degrees - 0.04); myRobot.turnRight(1/*speed*/, value/*time*/); } } else if(strcmp("stop",token) == 0) { stopper = 1; } else { std::cerr << "Unknown command '" << token << "'\n"; } } /* autoDrive() -- reads in file from ifstream, parses * and moves robot according to instructions in file */ void Navigator::autoDrive(string filename) { const int bufSize = 42; char fLine[bufSize]; ifstream infile; infile.open("autodrive.txt", fstream::in); while (!infile.eof()) { infile.getline(fLine, bufSize); Navigator::parseInstruction(fLine); } infile.close(); } I need this to break out of the while loop and end manualDrive because in my driver program the next function called is autoDrive.

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• Sockets receiving null (Android)

  - by Henrik

  I have a android app that is communicating with a server (written in java). Between these two parts I have established a Socket connection and want to send data. The problem I am having is that sometimes, for some users, the information that reaches the server is null. This works (for all phones, all users): Server: int a = Integer.parseInt(in.readLine()); int b = Integer.parseInt(in.readLine()); int c = Integer.parseInt(in.readLine()); int d = Integer.parseInt(in.readLine()); String checksum = in.readLine(); String model = in.readLine(); String device = in.readLine(); String name = in.readLine(); Client: out.println(a); out.println(b); out.println(c); out.println(d); out.println(hash); out.println(Build.MODEL); out.println(Build.DEVICE); String name = fixName(); out.print(name); out.flush(); This does not work (for some users): Server: int a = Integer.parseInt(in.readLine()); String checksum = in.readLine(); String model = in.readLine(); String device = in.readLine(); String name = in.readLine(); String msg = in.readLine(); int version = -1; String test = "hej"; try{ test = in.readLine(); version = Integer.parseInt(test); }catch(Exception e){ e.printStackTrace(); } Client: out.println(a); out.println(hash); out.println(Build.MODEL); out.println(Build.DEVICE); String name = fixName(); if(name == null) name = "John Doe"; out.println(name); String msg = fixMsg(); if(msg == null) name = "nada"; out.println(msg); out.println(curversion); out.flush(); Sometimes, in the second case, the name, msg, and version (the string test) are null at the server side. The catch is triggered because test is null. curversion,a are ints, the rest are strings. Any ideas?

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• Why does my laptop resume immediately after suspend?

  - by Igor Zinov'yev

  I seem to be having some problem with suspend mode. Every time I try to suspend my laptop, it just locks the screen. Or maybe it successfully suspends just to resume only an instant after. What could cause such a behaviour? I'm running 32-bit Ubuntu 12.04 with the 3.2.0-25 kernel on a HP dv5-1178er Pavilion laptop (Intel Core 2 Duo). Here are the relevant log sections: kern.log: Jun 1 10:42:21 igor-laptop kernel: [ 2225.131171] PM: Syncing filesystems ... done. Jun 1 10:42:21 igor-laptop kernel: [ 2225.141222] PM: Preparing system for mem sleep Jun 1 10:42:21 igor-laptop kernel: [ 2225.141239] Freezing user space processes ... (elapsed 0.01 seconds) done. Jun 1 10:42:21 igor-laptop kernel: [ 2225.156171] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done. Jun 1 10:42:21 igor-laptop kernel: [ 2225.172139] PM: Entering mem sleep Jun 1 10:42:21 igor-laptop kernel: [ 2225.172169] Suspending console(s) (use no_console_suspend to debug) Jun 1 10:42:21 igor-laptop kernel: [ 2225.172895] sd 0:0:0:0: [sda] Synchronizing SCSI cache Jun 1 10:42:21 igor-laptop kernel: [ 2225.181767] sd 0:0:0:0: [sda] Stopping disk Jun 1 10:42:21 igor-laptop kernel: [ 2225.251089] ene_ir 00:0a: wake-up capability enabled by ACPI Jun 1 10:42:21 igor-laptop kernel: [ 2225.251115] i8042 aux 00:09: wake-up capability disabled by ACPI Jun 1 10:42:21 igor-laptop kernel: [ 2225.251133] i8042 kbd 00:08: wake-up capability enabled by ACPI Jun 1 10:42:21 igor-laptop kernel: [ 2225.251286] jmb38x_ms 0000:06:00.3: PCI INT A disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.252491] sdhci-pci 0000:06:00.1: PCI INT A disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.264130] uhci_hcd 0000:00:1d.2: PCI INT D disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.264142] uhci_hcd 0000:00:1d.1: PCI INT B disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.264325] uhci_hcd 0000:00:1a.1: PCI INT B disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.288059] uhci_hcd 0000:00:1a.0: PCI INT A disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.288097] uhci_hcd 0000:00:1d.3: PCI INT C disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.288135] uhci_hcd 0000:00:1d.0: PCI INT A disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.316051] ehci_hcd 0000:00:1d.7: PCI INT A disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.316068] ehci_hcd 0000:00:1a.7: PCI INT D disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.522872] PM: suspend of drv:sd dev:0:0:0:0 complete after 349.979 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.522901] PM: suspend of drv:scsi dev:target0:0:0 complete after 349.955 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.522927] PM: suspend of drv:scsi dev:host0 complete after 272.260 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.522969] ahci 0000:00:1f.2: BIOS update required for suspend/resume Jun 1 10:42:21 igor-laptop kernel: [ 2225.522976] pci_legacy_suspend(): ahci_pci_device_suspend+0x0/0x80 returns -5 Jun 1 10:42:21 igor-laptop kernel: [ 2225.522981] pm_op(): pci_pm_suspend+0x0/0x110 returns -5 Jun 1 10:42:21 igor-laptop kernel: [ 2225.522984] PM: suspend of drv:ahci dev:0000:00:1f.2 complete after 258.932 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.522987] PM: Device 0000:00:1f.2 failed to suspend async: error -5 Jun 1 10:42:21 igor-laptop kernel: [ 2225.576228] snd_hda_intel 0000:00:1b.0: PCI INT A disabled Jun 1 10:42:21 igor-laptop kernel: [ 2225.576270] ACPI handle has no context! Jun 1 10:42:21 igor-laptop kernel: [ 2225.592136] PM: suspend of drv:snd_hda_intel dev:0000:00:1b.0 complete after 327.889 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.592206] PM: Some devices failed to suspend Jun 1 10:42:21 igor-laptop kernel: [ 2225.592291] uhci_hcd 0000:00:1a.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592298] uhci_hcd 0000:00:1a.0: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592325] usb usb3: root hub lost power or was reset Jun 1 10:42:21 igor-laptop kernel: [ 2225.592339] uhci_hcd 0000:00:1a.1: PCI INT B -> GSI 21 (level, low) -> IRQ 21 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592345] uhci_hcd 0000:00:1a.1: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592371] usb usb4: root hub lost power or was reset Jun 1 10:42:21 igor-laptop kernel: [ 2225.592387] ehci_hcd 0000:00:1a.7: PCI INT D -> GSI 19 (level, low) -> IRQ 19 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592395] ehci_hcd 0000:00:1a.7: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592843] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592851] uhci_hcd 0000:00:1d.0: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592854] uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 19 (level, low) -> IRQ 19 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592863] uhci_hcd 0000:00:1d.1: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592878] usb usb5: root hub lost power or was reset Jun 1 10:42:21 igor-laptop kernel: [ 2225.592892] usb usb6: root hub lost power or was reset Jun 1 10:42:21 igor-laptop kernel: [ 2225.592895] uhci_hcd 0000:00:1d.2: PCI INT D -> GSI 16 (level, low) -> IRQ 16 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592903] uhci_hcd 0000:00:1d.2: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592906] uhci_hcd 0000:00:1d.3: PCI INT C -> GSI 18 (level, low) -> IRQ 18 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592915] uhci_hcd 0000:00:1d.3: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592930] usb usb7: root hub lost power or was reset Jun 1 10:42:21 igor-laptop kernel: [ 2225.592946] usb usb8: root hub lost power or was reset Jun 1 10:42:21 igor-laptop kernel: [ 2225.592949] ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 20 (level, low) -> IRQ 20 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592957] ehci_hcd 0000:00:1d.7: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.592963] pci 0000:00:1e.0: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.597106] sd 0:0:0:0: [sda] Starting disk Jun 1 10:42:21 igor-laptop kernel: [ 2225.608138] snd_hda_intel 0000:00:1b.0: BAR 0: set to [mem 0xdf300000-0xdf303fff 64bit] (PCI address [0xdf300000-0xdf303fff]) Jun 1 10:42:21 igor-laptop kernel: [ 2225.608180] snd_hda_intel 0000:00:1b.0: restoring config space at offset 0xf (was 0x100, writing 0x10b) Jun 1 10:42:21 igor-laptop kernel: [ 2225.608233] snd_hda_intel 0000:00:1b.0: restoring config space at offset 0x3 (was 0x0, writing 0x10) Jun 1 10:42:21 igor-laptop kernel: [ 2225.608248] snd_hda_intel 0000:00:1b.0: restoring config space at offset 0x1 (was 0x100000, writing 0x100002) Jun 1 10:42:21 igor-laptop kernel: [ 2225.608299] snd_hda_intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 Jun 1 10:42:21 igor-laptop kernel: [ 2225.608313] snd_hda_intel 0000:00:1b.0: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.608420] snd_hda_intel 0000:00:1b.0: irq 50 for MSI/MSI-X Jun 1 10:42:21 igor-laptop kernel: [ 2225.612095] firewire_ohci 0000:06:00.0: restoring config space at offset 0x1 (was 0x100000, writing 0x100006) Jun 1 10:42:21 igor-laptop kernel: [ 2225.612181] sdhci-pci 0000:06:00.1: restoring config space at offset 0x1 (was 0x100003, writing 0x100007) Jun 1 10:42:21 igor-laptop kernel: [ 2225.612211] sdhci-pci 0000:06:00.1: PCI INT A -> GSI 16 (level, low) -> IRQ 16 Jun 1 10:42:21 igor-laptop kernel: [ 2225.612225] sdhci-pci 0000:06:00.1: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.612296] jmb38x_ms 0000:06:00.3: restoring config space at offset 0x1 (was 0x100003, writing 0x100007) Jun 1 10:42:21 igor-laptop kernel: [ 2225.612326] jmb38x_ms 0000:06:00.3: PCI INT A -> GSI 16 (level, low) -> IRQ 16 Jun 1 10:42:21 igor-laptop kernel: [ 2225.612332] jmb38x_ms 0000:06:00.3: setting latency timer to 64 Jun 1 10:42:21 igor-laptop kernel: [ 2225.699170] PM: resume of drv:uvcvideo dev:2-4:1.0 complete after 101.965 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.699179] PM: resume of drv:uvcvideo dev:2-4:1.1 complete after 101.932 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.699186] PM: resume of drv: dev:ep_00 complete after 101.917 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.699197] PM: resume of drv: dev:ep_83 complete after 101.972 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716148] PM: resume of drv:hub dev:3-0:1.0 complete after 119.543 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716155] PM: resume of drv: dev:ep_00 complete after 119.544 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716161] PM: resume of drv:hub dev:5-0:1.0 complete after 119.420 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716168] PM: resume of drv: dev:ep_00 complete after 119.381 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716174] PM: resume of drv:hub dev:8-0:1.0 complete after 119.141 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716181] PM: resume of drv: dev:ep_00 complete after 119.104 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716186] PM: resume of drv: dev:ep_81 complete after 119.579 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716191] PM: resume of drv: dev:ep_81 complete after 119.427 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.716197] PM: resume of drv: dev:ep_81 complete after 119.143 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.747148] firewire_core: skipped bus generations, destroying all nodes Jun 1 10:42:21 igor-laptop kernel: [ 2225.776093] PM: resume of drv:hp_accel dev:HPQ0004:00 complete after 167.225 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.777243] i8042 kbd 00:08: wake-up capability disabled by ACPI Jun 1 10:42:21 igor-laptop kernel: [ 2225.777278] ene_ir 00:0a: wake-up capability disabled by ACPI Jun 1 10:42:21 igor-laptop kernel: [ 2225.820100] PM: resume of drv:hub dev:4-0:1.0 complete after 223.436 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820115] PM: resume of drv: dev:ep_00 complete after 223.444 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820123] PM: resume of drv: dev:ep_81 complete after 223.456 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820206] PM: resume of drv:hub dev:7-0:1.0 complete after 223.266 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820221] PM: resume of drv: dev:ep_81 complete after 223.260 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820238] PM: resume of drv: dev:ep_00 complete after 223.255 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820295] PM: resume of drv:hub dev:6-0:1.0 complete after 223.453 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820302] PM: resume of drv: dev:ep_00 complete after 223.415 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.820321] PM: resume of drv: dev:ep_81 complete after 223.457 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2225.932108] usb 4-2: reset full-speed USB device number 2 using uhci_hcd Jun 1 10:42:21 igor-laptop kernel: [ 2226.086714] PM: resume of drv:usbhid dev:4-2:1.0 complete after 489.393 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.086728] PM: resume of drv: dev:ep_81 complete after 489.384 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.086745] PM: resume of drv: dev:ep_00 complete after 489.329 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.086753] PM: resume of drv:usbhid dev:4-2:1.1 complete after 489.384 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.086764] PM: resume of drv: dev:ep_82 complete after 489.373 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.180555] usb 7-2: reset full-speed USB device number 2 using uhci_hcd Jun 1 10:42:21 igor-laptop kernel: [ 2226.244858] firewire_core: rediscovered device fw0 Jun 1 10:42:21 igor-laptop kernel: [ 2226.335066] btusb 7-2:1.0: no reset_resume for driver btusb? Jun 1 10:42:21 igor-laptop kernel: [ 2226.335068] btusb 7-2:1.1: no reset_resume for driver btusb? Jun 1 10:42:21 igor-laptop kernel: [ 2226.432082] usb 6-1: reset full-speed USB device number 2 using uhci_hcd Jun 1 10:42:21 igor-laptop kernel: [ 2226.578280] PM: resume of drv:nvidia dev:0000:01:00.0 complete after 985.301 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584296] PM: resume of drv:usb dev:7-2:1.0 complete after 986.693 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584308] PM: resume of drv: dev:ep_00 complete after 986.452 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584311] PM: resume of drv:usb dev:7-2:1.1 complete after 986.616 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584315] PM: resume of drv:usb dev:7-2:1.3 complete after 986.483 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584320] PM: resume of drv:usb dev:7-2:1.2 complete after 986.556 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584328] PM: resume of drv: dev:ep_03 complete after 986.588 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584331] PM: resume of drv: dev:ep_81 complete after 986.704 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584334] PM: resume of drv: dev:ep_83 complete after 986.617 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584337] PM: resume of drv: dev:ep_82 complete after 986.688 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584340] PM: resume of drv: dev:ep_02 complete after 986.667 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584344] PM: resume of drv: dev:ep_84 complete after 986.558 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.584352] PM: resume of drv: dev:ep_04 complete after 986.542 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.590883] PM: resume of drv: dev:ep_00 complete after 993.327 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.590887] PM: resume of drv:usb dev:6-1:1.0 complete after 993.424 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.590927] PM: resume of drv: dev:ep_82 complete after 993.395 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.590934] PM: resume of drv: dev:ep_81 complete after 993.426 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.590940] PM: resume of drv: dev:ep_01 complete after 993.456 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.592450] PM: resume of drv:sd dev:0:0:0:0 complete after 995.343 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.592461] PM: resume of drv:scsi_disk dev:0:0:0:0 complete after 802.688 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.592472] PM: resume of drv:scsi_device dev:0:0:0:0 complete after 995.324 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.600339] PM: resume of devices complete after 1008.129 msecs Jun 1 10:42:21 igor-laptop kernel: [ 2226.601293] PM: resume devices took 1.008 seconds Jun 1 10:42:21 igor-laptop kernel: [ 2226.601330] PM: Finishing wakeup. Jun 1 10:42:21 igor-laptop kernel: [ 2226.601332] Restarting tasks ... done. Jun 1 10:42:21 igor-laptop kernel: [ 2226.625660] video LNXVIDEO:01: Restoring backlight state Jun 1 10:42:22 igor-laptop kernel: [ 2227.478921] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S Jun 1 10:42:22 igor-laptop kernel: [ 2227.481981] iwlwifi 0000:02:00.0: Radio type=0x1-0x2-0x0 Jun 1 10:42:22 igor-laptop kernel: [ 2227.527727] ADDRCONF(NETDEV_UP): wlan0: link is not ready Jun 1 10:42:22 igor-laptop kernel: [ 2227.532468] r8169 0000:03:00.0: eth0: link down Jun 1 10:42:22 igor-laptop kernel: [ 2227.533967] ADDRCONF(NETDEV_UP): eth0: link is not ready pm_suspend.log: Fri Jun 1 10:42:14 MSK 2012: Running hooks for suspend. Running hook /usr/lib/pm-utils/sleep.d/000kernel-change suspend suspend: /usr/lib/pm-utils/sleep.d/000kernel-change suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/00logging suspend suspend: Linux igor-laptop 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:33:05 UTC 2012 i686 i686 i386 GNU/Linux Module Size Used by pci_stub 12550 1 vboxpci 22882 0 vboxnetadp 13328 0 vboxnetflt 27211 0 vboxdrv 252189 3 vboxpci,vboxnetadp,vboxnetflt dm_crypt 22528 0 snd_hda_codec_hdmi 31775 1 snd_hda_codec_idt 60251 1 arc4 12473 2 hp_wmi 13652 0 sparse_keymap 13658 1 hp_wmi rfcomm 38139 12 snd_hda_intel 32765 5 snd_hda_codec 109562 3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel snd_hwdep 13276 1 snd_hda_codec bnep 17830 2 btusb 17912 2 bluetooth 158438 23 rfcomm,bnep,btusb joydev 17393 0 parport_pc 32114 0 snd_pcm 80845 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec ppdev 12849 0 uvcvideo 67203 0 binfmt_misc 17292 1 videodev 86588 1 uvcvideo snd_seq_midi 13132 0 snd_rawmidi 25424 1 snd_seq_midi nvidia 10958194 43 snd_seq_midi_event 14475 1 snd_seq_midi snd_seq 51567 2 snd_seq_midi,snd_seq_midi_event ir_lirc_codec 12739 0 lirc_dev 18700 1 ir_lirc_codec snd_timer 28931 2 snd_pcm,snd_seq snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq ir_mce_kbd_decoder 12681 0 ir_sony_decoder 12462 0 ir_jvc_decoder 12459 0 ir_rc6_decoder 12459 0 psmouse 87213 0 ir_rc5_decoder 12459 0 serio_raw 13027 0 iwlwifi 287934 0 rc_rc6_mce 12454 0 ir_nec_decoder 12459 0 ene_ir 18019 0 rc_core 21263 10 ir_lirc_codec,ir_mce_kbd_decoder,ir_sony_decoder,ir_jvc_decoder,ir_rc6_decoder,ir_rc5_decoder,rc_rc6_mce,ir_nec_decoder,ene_ir mac80211 436455 1 iwlwifi snd 62064 19 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device cfg80211 178679 2 iwlwifi,mac80211 hp_accel 25728 0 lis3lv02d 19268 1 hp_accel input_polldev 13648 1 lis3lv02d mac_hid 13077 0 wmi 18744 1 hp_wmi jmb38x_ms 17406 0 soundcore 14635 1 snd snd_page_alloc 14115 2 snd_hda_intel,snd_pcm memstick 15857 1 jmb38x_ms firewire_sbp2 18346 0 lp 17455 0 parport 40930 3 parport_pc,ppdev,lp vesafb 13516 1 usbhid 41906 0 hid 77367 1 usbhid firewire_ohci 40180 0 firewire_core 56906 2 firewire_sbp2,firewire_ohci crc_itu_t 12627 1 firewire_core sdhci_pci 18324 0 sdhci 28241 1 sdhci_pci r8169 56321 0 video 19068 0 total used free shared buffers cached Mem: 3095544 2364260 731284 0 159020 1280240 -/+ buffers/cache: 925000 2170544 Swap: 1718916 0 1718916 /usr/lib/pm-utils/sleep.d/00logging suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/00powersave suspend suspend: /usr/lib/pm-utils/sleep.d/00powersave suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/01PulseAudio suspend suspend: Welcome to PulseAudio! Use "help" for usage information. >>> >>> Welcome to PulseAudio! Use "help" for usage information. >>> >>> Welcome to PulseAudio! Use "help" for usage information. >>> >>> /usr/lib/pm-utils/sleep.d/01PulseAudio suspend suspend: success. Running hook /etc/pm/sleep.d/10_grub-common suspend suspend: /etc/pm/sleep.d/10_grub-common suspend suspend: success. Running hook /etc/pm/sleep.d/10_unattended-upgrades-hibernate suspend suspend: /etc/pm/sleep.d/10_unattended-upgrades-hibernate suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/55NetworkManager suspend suspend: Having NetworkManager put all interaces to sleep...Failed. /usr/lib/pm-utils/sleep.d/55NetworkManager suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend: Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory /usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/75modules suspend suspend: /usr/lib/pm-utils/sleep.d/75modules suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/90clock suspend suspend: /usr/lib/pm-utils/sleep.d/90clock suspend suspend: not applicable. Running hook /usr/lib/pm-utils/sleep.d/94cpufreq suspend suspend: /usr/lib/pm-utils/sleep.d/94cpufreq suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/95anacron suspend suspend: stop: Unknown instance: /usr/lib/pm-utils/sleep.d/95anacron suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/95hdparm-apm suspend suspend: /usr/lib/pm-utils/sleep.d/95hdparm-apm suspend suspend: not applicable. Running hook /usr/lib/pm-utils/sleep.d/95led suspend suspend: /usr/lib/pm-utils/sleep.d/95led suspend suspend: not applicable. Running hook /usr/lib/pm-utils/sleep.d/98video-quirk-db-handler suspend suspend: nVidia binary video drive detected, not using quirks. /usr/lib/pm-utils/sleep.d/98video-quirk-db-handler suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/99video suspend suspend: kernel.acpi_video_flags = 0 /usr/lib/pm-utils/sleep.d/99video suspend suspend: success. Running hook /etc/pm/sleep.d/novatel_3g_suspend suspend suspend: /etc/pm/sleep.d/novatel_3g_suspend suspend suspend: success. Fri Jun 1 10:42:19 MSK 2012: performing suspend Fri Jun 1 10:42:21 MSK 2012: Awake. Fri Jun 1 10:42:21 MSK 2012: Running hooks for resume Running hook /etc/pm/sleep.d/novatel_3g_suspend resume suspend: /etc/pm/sleep.d/novatel_3g_suspend resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/99video resume suspend: /usr/lib/pm-utils/sleep.d/99video resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/98video-quirk-db-handler resume suspend: /usr/lib/pm-utils/sleep.d/98video-quirk-db-handler resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/95led resume suspend: /usr/lib/pm-utils/sleep.d/95led resume suspend: not applicable. Running hook /usr/lib/pm-utils/sleep.d/95hdparm-apm resume suspend: /dev/sda: setting Advanced Power Management level to 0xfe (254) APM_level = 254 /dev/sda: setting Advanced Power Management level to 0xfe (254) APM_level = 254 /usr/lib/pm-utils/sleep.d/95hdparm-apm resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/95anacron resume suspend: /usr/lib/pm-utils/sleep.d/95anacron resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/94cpufreq resume suspend: /usr/lib/pm-utils/sleep.d/94cpufreq resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/90clock resume suspend: /usr/lib/pm-utils/sleep.d/90clock resume suspend: not applicable. Running hook /usr/lib/pm-utils/sleep.d/75modules resume suspend: Reloaded unloaded modules. /usr/lib/pm-utils/sleep.d/75modules resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/60_wpa_supplicant resume suspend: Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory /usr/lib/pm-utils/sleep.d/60_wpa_supplicant resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/55NetworkManager resume suspend: Having NetworkManager wake interfaces back up...Failed. /usr/lib/pm-utils/sleep.d/55NetworkManager resume suspend: success. Running hook /etc/pm/sleep.d/10_unattended-upgrades-hibernate resume suspend: /etc/pm/sleep.d/10_unattended-upgrades-hibernate resume suspend: success. Running hook /etc/pm/sleep.d/10_grub-common resume suspend: /etc/pm/sleep.d/10_grub-common resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/01PulseAudio resume suspend: Welcome to PulseAudio! Use "help" for usage information. >>> >>> Welcome to PulseAudio! Use "help" for usage information. >>> >>> Welcome to PulseAudio! Use "help" for usage information. >>> >>> /usr/lib/pm-utils/sleep.d/01PulseAudio resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/00powersave resume suspend: /usr/lib/pm-utils/sleep.d/00powersave resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/00logging resume suspend: /usr/lib/pm-utils/sleep.d/00logging resume suspend: success. Running hook /usr/lib/pm-utils/sleep.d/000kernel-change resume suspend: /usr/lib/pm-utils/sleep.d/000kernel-change resume suspend: success. Fri Jun 1 10:42:22 MSK 2012: Finished.

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• NHibernate.PropertyValueException : not-null property references a null or transient

  - by frosty

  I am getting the following exception. NHibernate.PropertyValueException : not-null property references a null or transient Here are my mapping files. Product <class name="Product" table="Products"> <id name="Id" type="Int32" column="Id" unsaved-value="0"> <generator class="identity"/> </id> <set name="PriceBreaks" table="PriceBreaks" generic="true" cascade="all" inverse="true" > <key column="ProductId" /> <one-to-many class="EStore.Domain.Model.PriceBreak, EStore.Domain" /> </set> </class> Price Breaks <class name="PriceBreak" table="PriceBreaks"> <id name="Id" type="Int32" column="Id" unsaved-value="0"> <generator class="identity"/> </id> <property name="ProductId" column="ProductId" type="Int32" not-null="true" /> <many-to-one name="Product" column="ProductId" not-null="true" cascade="all" class="EStore.Domain.Model.Product, EStore.Domain" /> </class> I get the exception on the following method [Test] public void Can_Add_Price_Break() { IPriceBreakRepository repo = new PriceBreakRepository(); var priceBreak = new PriceBreak(); priceBreak.ProductId = 19; repo.Add(priceBreak); Assert.Greater(priceBreak.Id, 0); }

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• Binding a null variable in a PreparedStatement

  - by Paul Tomblin

  I swear this used to work, but it's not in this case. I'm trying to match col1, col2 and col3, even if one or more of them is null. I know that in some languages I've had to resort to circumlocutions like ((? is null AND col1 is null) OR col1 = ?). Is that required here? PreparedStatement selStmt = getConn().prepareStatement( "SELECT * " + "FROM tbl1 " + "WHERE col1 = ? AND col2 = ? and col3 = ?"); try { int col = 1; setInt(selStmt, col++, col1); setInt(selStmt, col++, col2); setInt(selStmt, col++, col3); ResultSet rs = selStmt.executeQuery(); try { while (rs.next()) { // process row } } finally { rs.close(); } } finally { selStmt.close(); } // Does the equivalient of stmt.setInt(col, i) but preserves nullness. protected static void setInt(PreparedStatement stmt, int col, Integer i) throws SQLException { if (i == null) stmt.setNull(col, java.sql.Types.INTEGER); else stmt.setInt(col, i); }

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• What is a NULL value

  - by Adi

  I am wondering , what exactly is stored in the memory when we say a particular variable pointer to be NULL. suppose I have a structure, say typdef struct MEM_LIST MEM_INSTANCE; struct MEM_LIST { char *start_addr; int size; MEM_INSTANCE *next; }; MEM_INSTANCE *front; front = (MEM_INSTANCE*)malloc(sizeof(MEM_INSTANCE*)); -1) If I make front=NULL. What will be the value which actually gets stored in the different fields of the front, say front-size ,front-start_addr. Is it 0 or something else. I have limited knowledge in this NULL thing. -2) If I do a free(front); It frees the memory which is pointed out by front. So what exactly free means here, does it make it NULL or make it all 0. -3) What can be a good strategy to deal with initialization of pointers and freeing them . Thanks in advance

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• Dev-C++ Run Program in Background without GUI

  - by Lienau

  I recently began learning C++ in order to reach people w/o .net. I need to run my program in the background(without any visual indication to the user so no window or cmd). I know there a various methods to do this In C#, but I don't know how to do this in C++ (specifically Dev-C++). Any help is greatly appreciated.

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• Improving performance in this query

  - by Luiz Gustavo F. Gama

  I have 3 tables with user logins: sis_login = administrators tb_rb_estrutura = coordinators tb_usuario = clients I created a VIEW to unite all these users by separating them by levels, as follows: create view `login_names` as select `n1`.`cod_login` as `id`, '1' as `level`, `n1`.`nom_user` as `name` from `dados`.`sis_login` `n1` union all select `n2`.`id` as `id`, '2' as `level`, `n2`.`nom_funcionario` as `name` from `tb_rb_estrutura` `n2` union all select `n3`.`cod_usuario` as `id`, '3' as `level`, `n3`.`dsc_nome` as `name` from `tb_usuario` `n3`; So, can occur up to three ids repeated for different users, which is why I separated by levels. This VIEW is just to return me user name, according to his id and level. considering it has about 500,000 registered users, this view takes about 1 second to load. too much time, but is becomes very small when I need to return the latest posts on the forum of my website. The tables of the forums return the user id and level, then look for a name in this VIEW. I have registered 18 forums. When I run the query, it takes one second for each forum = 18 seconds. OMG. This page loads every time somebody enter my website. This is my query: select `x`.`forum_id`, `x`.`topic_id`, `l`.`nome` from ( select `t`.`forum_id`, `t`.`topic_id`, `t`.`data`, `t`.`user_id`, `t`.`user_level` from `tb_forum_topics` `t` union all select `a`.`forum_id`, `a`.`topic_id`, `a`.`data`, `a`.`user_id`, `a`.`user_level` from `tb_forum_answers` `a` ) `x` left outer join `login_names` `l` on `l`.`id` = `x`.`user_id` and `l`.`level` = `x`.`user_level` group by `x`.`forum_id` asc USING EXPLAIN: id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 Using temporary; Using filesort 1 PRIMARY <derived4> ALL NULL NULL NULL NULL 530415 4 DERIVED n1 ALL NULL NULL NULL NULL 114 5 UNION n2 ALL NULL NULL NULL NULL 2 6 UNION n3 ALL NULL NULL NULL NULL 530299 NULL UNION RESULT ALL NULL NULL NULL NULL NULL 2 DERIVED t ALL NULL NULL NULL NULL 3 3 UNION r ALL NULL NULL NULL NULL 3 NULL UNION RESULT ALL NULL NULL NULL NULL NULL Somebody can help me or give a suggestion?

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• webpart context.session is null

  - by tbischel

  I've been using the session array to store a state variable for my webpart... so I have a property like this: public INode RootNode { get { return this.Context.Session["RootNode"] as INode; } set { this.Context.Session["RootNode"] = value as object; } } This usually works fine. I've discovered that sometimes, the context.session variable will be null. I'd like to know what are the conditions that cause the session to be null in the first place, and whats the best way to persist my object when this happens? Can I just assign a new HttpSessionState object to the context, or does that screw things up? Edit: Ok, so its not just the session that is null... the whole context is screwed up. When the webpart enters the init, the context is fine... but when it reaches the dropbox selectedindexchange postback event (the dropbox contains node id's to use to set the rootnode variable), the context contains mostly null properties. also, it only seems to happen when certain id's are selected. This looks more like some kind of weird bug on my end than a problem with my understanding of the session.

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• Android dev time vs iPhone dev time

  - by Daniel Benedykt

  Hi IF someone has to develop the same application for Android and iPhone, is it more difficult to develop in one platform than on the other? Does it take more time? Lets think about the average app. Lists, text , buttons, fetch information from the internet. Thanks

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• JSON Feed Returning null while using jQuery getJSON

  - by Oscar Godson

  http://portlandonline.com/shared/cfm/json.cfm?c=27321 It's returning null. I don't really have access to this. I have to have a server admin update the feed to my liking, so if you can tell me how to get this to work as is, without adding tags to my HTML please let me know. I will be using this with jQuery, and ive been trying to use getJSON which is what returns null. $.getJSON('http://portlandonline.com/shared/cfm/json.cfm?c=27321',function(json){ alert(json); }); that returns null. But if i use a flickr feed for example, it works fine. it returns what it should, [onject Object]. Any ideas?

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• When would ShowDialog() return null?

  - by Joe White

  WPF's Window.ShowDialog method returns a nullable boolean. So does CommonDialog.ShowDialog. Now, I understand cases where these would return false (user clicked Cancel or pressed Esc), and when they would return true (code sets Window.DialogResult to true, probably in response to OK being clicked). But null? My first thought is that clicking the title bar's Close button might return null. But the docs state (and I confirmed by testing) that the title-bar Close button is treated as a Cancel. So when would Window.ShowDialog or CommonDialog.ShowDialog ever return null?

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• check if(country == @"(null)" doesn't work

  - by Sean

  hi all, I got the problem that the if-statement doesn't work. After the first code line the variable contains the value "(null)", because the user who picked the contact from his iphone address book doesn't set the country key for this contact, so far so good. but if I check the variable, it won't be true, but the value is certainly "(null)"... does someone have an idea? NSString *country = [NSString [the dict objectForKey:(NSString *)kABPersonAddressCountryKey]]; if(country == @"(null)") { country = @""; } thanks in advance sean

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• NULL handling with subselect in Hibernate Criteria API

  - by Jens Schauder

  I'm constructing a Hibernate Criterion, using a subselect as follows DetachedCriteria subselect = DetachedCriteria.forClass(NhmCode.class, "sub"); // the subselect selecting the maximum 'validFrom' subselect.add(Restrictions.le("validFrom", new Date())); // it should be in the past (null needs handling here) subselect.add(Property.forName("sub.lifeCycle").eqProperty("this.id")); // join to owning entity subselect.setProjection(Projections.max("validFrom")); // we are only interested in the maximum validFrom Conjunction resultCriterion = Restrictions.conjunction(); resultCriterion.add(Restrictions.ilike(property, value)); // I have other Restrictions as well resultCriterion.add(Property.forName("validFrom").eq(subselect)); // this fails when validFrom and the subselect return NULL return resultCriterion; It works ok so far, but the restriction on the last line before the return statement is false when validFrom and subselect result in NULL. What I need is a version which handles this case as true. Possibly by applying a NVL or coalesce or similar. How do I do this?

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• How to avoid null pointer error

  - by Jessy

  I trying to find whether the elements of 2 arrayLists are match or not. But this code give me error Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException since some of the elements are null. How can I solved this problem? String level []={"High","High","High","High","High","High"}; ArrayList<Object> n = new ArrayList<Object>(Arrays.asList(level)); String choice []={null,"High","Low","High",null,"Medium"}; ArrayList<Object> m = new ArrayList<Object>(Arrays.asList(choice)); //Check if the two arrayList are identical for(int i=0; i<m.size(); i++){ if(!(m.get(i).equals(n.get(i)))){ result= true; break; } } return result; }

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• Richfaces a4j achtionparam set null value

  - by Jurgen H

  I am trying to reset some values in a form using the a4j:actionParam tag. But it seams that null values never arrive in the target bean. The converter receives it correctly, returns null, but it is never set in the bean. The target is to fill in the start and endDate for different predefined values (last week, last month etc). For the "This week" value, the endDate must be reset to null. <rich:menuItem value="Last week"> <a4j:support event="onclick" reRender="criteriaStartCalendar,criteriaEndCalendar"> <a4j:actionparam name="startDate" value="#{dateBean.lastWeekStart}" assignTo="#{targetBean.startDate}" /> <a4j:actionparam name="endDate" value="#{dateBean.lastWeekEnd}" assignTo="#{targetBean.endDate}" /> </a4j:support> </rich:menuItem>

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• Querying MySQL with CodeIgniter, selecting rows where field is NULL

  - by rebellion

  I'm using CodeIgniter's Active Record class to query the MySQL database. I need to select the rows in a table where a field is not set to NULL: $this->db->where('archived !=', 'NULL'); $q = $this->db->get('projects'); That only returns this query: SELECT * FROM projects WHERE archived != 'NULL'; The archived field is a DATE field. Is there a better way to solve this? I know I can just write the query myself, but I wan't to stick with the Active Record throughout my code.

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• IS NULL doesn't work as expected in SQL Server 2000 with no Service Pack on it

  - by user306825

  The following batch executed on different instances of SQL Server 2000 illustrates the problem. select @@version create table a (a int) create table b (b int) insert into a(a) values (1) insert into a(a) values (2) insert into a(a) values (3) insert into b(b) values (1) insert into b(b) values (2) select * from a left outer join (select 1 as test, b from b) as j on j.b = a.a where j.test IS NULL drop table a drop table b Output 1: Microsoft SQL Server 2000 - 8.00.194 (Intel X86) Aug 6 2000 00:57:48 Copyright (c) 1988-2000 Microsoft Corporation Developer Edition on Windows NT 6.1 (Build 7600: ) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) a test b ----------- ----------- ----------- (0 row(s) affected) Output 2: Microsoft SQL Server 2000 - 8.00.2039 (Intel X86) May 3 2005 23:18:38 Copyright (c) 1988-2003 Microsoft Corporation Developer Edition on Windows NT 5.2 (Build 3790: Service Pack 2) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) a test b ----------- ----------- ----------- 3 NULL NULL (1 row(s) affected) If someone encounters the same problem - make sure you have the SP installed!

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• DB4o Linq query - How to check for null strings

  - by Dave

  Hey there - simple query: var q = (from SomeObject o in container where o.SomeInt > 8 && o.SomeString != null //Null Ref here select o; I always get a null reference exception. If I use String.IsNullOrEmpty(o.SomeString) the query takes about 100 times as long, as if I use && o.SomeString != "" (which is way faster, but obviously not correct). I'm guessing because DB4o needs to activate the objects, in order to pass them in to the IsNullOrEmpty call, and can't use the indexes. My question is, what's a better way to check for nulls in this situation? Is there something like: mystring != Db4o.DBNull.Value, or something? Cheers, Dave

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• IS NULL doesn't work as expected in MSSQL 2000 with no Service Pack on it

  - by user306825

  The following batch executed on different instances of mssql 2000 illustrates the problem. select @@version create table a (a int) create table b (b int) insert into a(a) values (1) insert into a(a) values (2) insert into a(a) values (3) insert into b(b) values (1) insert into b(b) values (2) select * from a left outer join (select 1 as test, b from b) as j on j.b = a.a where j.test IS NULL drop table a drop table b Output 1: Microsoft SQL Server 2000 - 8.00.194 (Intel X86) Aug 6 2000 00:57:48 Copyright (c) 1988-2000 Microsoft Corporation Developer Edition on Windows NT 6.1 (Build 7600: ) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) a test b (0 row(s) affected) Output 2: Microsoft SQL Server 2000 - 8.00.2039 (Intel X86) May 3 2005 23:18:38 Copyright (c) 1988-2003 Microsoft Corporation Developer Edition on Windows NT 5.2 (Build 3790: Service Pack 2) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) (1 row(s) affected) a test b 3 NULL NULL (1 row(s) affected) If someone encounters the same problem - make sure you have the SP installed!

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• Map null column as 0 in a legacy database (JPA)

  - by Indrek

  Using Play! framework and it's JPASupport class I have run into a problem with a legacy database. I have the following class: @Entity @Table(name="product_catalog") public class ProductCatalog extends JPASupport { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) public Integer product_catalog; @OneToOne @JoinColumn(name="upper_catalog") public ProductCatalog upper_catalog; public String name; } Some product catalogs don't have an upper catalog, and this is referenced as 0 in a legacy database. If I supply the upper_catalog as NULL, then expectedly JPA inserts a NULL value to that database column. How could I force the null values to be 0 when writing to the database and the other way around when reading from the database?

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• Accommodating null values in a list?

  - by h259bws

  Hi, I'm new to Java and Groovy and am running into trouble with the following Groovy script. I created this whittled down version of a larger script to facilitate debugging. The script is iterating through a list trying to calc a running total of the values of all objects in the list. Some or all of these objects' values may be null. Script import org.apache.commons.lang.math.NumberUtils class Field { def name def value } def fields = [ new Field(name:'Annuities %', value:75), new Field(name:'Other %', value:null), ] //def totalFunding = fields.inject(0) {int total, Field myField - // total + NumberUtils.toInt(myField.value,0) as Integer def totalFunding = fields.inject(0) {int total, Field myField - total + myField?.value as Integer } It gets this error: Exception thrown: java.lang.NullPointerException java.lang.NullPointerException at Script3$_run_closure1.doCall(Script3:15) at Script3.run(Script3:14) What is the correct way to accomodate null values? Thanks, Betsy

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• Why DataTable not showing the NULL values?

  - by thevan

  I have one DataTable Which I gets from the BackEnd. But When I fix the BreakPoint and Visualize the DataTable, It does not show the NULL values. Why is it so? In the BackEnd, My Table looks like below: CustID JobID Qty ---------- -------- ------ 1 NULL 100 2 1 200 But in the FrontEnd, My DataTable looks like below: CustID JobID Qty ---------- -------- ------ 1 100 2 1 200 Why it is not showing the NULL Values? Is there any specific reason? How to show the DataTable as it is like in the BackEnd?

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• Calculating the null space of a matrix

  - by Ainsworth

  I'm attempting to solve a set of equations of the form Ax = 0. A is known 6x6 matrix and I've written the below code using SVD to get the vector x which works to a certain extent. The answer is approximately correct but not good enough to be useful to me, how can I improve the precision of the calculation? Lowering eps below 1.e-4 causes the function to fail. from numpy.linalg import * from numpy import * A = matrix([[0.624010149127497 ,0.020915658603923 ,0.838082638087629 ,62.0778180312547 ,-0.336 ,0], [0.669649399820597 ,0.344105317421833 ,0.0543868015800246 ,49.0194290212841 ,-0.267 ,0], [0.473153758252885 ,0.366893577716959 ,0.924972565581684 ,186.071352614705 ,-1 ,0], [0.0759305208803158 ,0.356365401030535 ,0.126682113674883 ,175.292109352674 ,0 ,-5.201], [0.91160934274653 ,0.32447818779582 ,0.741382053883291 ,0.11536775372698 ,0 ,-0.034], [0.480860406786873 ,0.903499596111067 ,0.542581424762866 ,32.782593418975 ,0 ,-1]]) def null(A, eps=1e-3): u,s,vh = svd(A,full_matrices=1,compute_uv=1) null_space = compress(s <= eps, vh, axis=0) return null_space.T NS = null(A) print "Null space equals ",NS,"\n" print dot(A,NS)

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